Concrete-and-iron girder, &amp;c.



SEARCH ROOM PUBMED AUG. 1s, 1903. t

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APPLXOAIXOI .ULEB lll. 5. 1903.

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j 72. MASONRY a coNcReTE STRUCTURES, Axches, G'uders, Metal renfnzarow.

CONCRETE AND IRON GIRDIIR,l ko.l

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' provenients in Roofs, Beams, Git-ders, and

UNITED STATES Patented August 1s, reos.

PATENT OFFICE.

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SPECIFICATION forming part of Letters Patent No. 736,718, dated August 18, 1903.

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To "Il whom it muy concern.-

Be it known that I, RUDoL Grunn, a subject of the Emperor of .\ustria-lluu;zary, residing at Vienna, in the Province of Lower Austria, in the Empire of Austria-Hungary, have invented certain new and useful Im- Like Structures of Concrete and Iron; and I do hereby declare the followingy to be a full," clear, and exactl description of the'invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to roofs, beams, girders, and like structures (hereinafter included in the term girder) of concrete and iron.

A girder according to this invention is constructed of concrete with iron or other snitable metal insertions. Among its distinguishing features are the use ot bearing or supporting plates of iron or other suitable metal, the placing of the metal insertions in tensional strain, and its method of construe tion with the aid of a mold or like structure without intermediate supportthat is to say, which is scifi-supporting;r between the points of support of the girdcr.

In constructing a concrete-andiron girder in accordance with this invention its metal insertions, consistingof metal of bar, round, or other suitable section, ure embedded while under tensional strain in the concrete and the bearing portions oi the girder are formed by means of the metal. insertions, which project from the concreteat both ends of the girder and are connected to met-al pieces of suitable section that rest freely on the supports of the girder.

The aforesaid self-supportingr mold or like structure is preferably formed of wood in combination with tho metalinsertions that are intended to strengthen the concrete ofthe gir-der.

In the accompanying drawings, which are given solely by way of example for the purpose of enabling this invention to be more clearly understood, Figures 1 and 2 are similar longitudinal sectionsof a concrete-andiron girder according to this invention, il1us- Serial Xo. 148,332. (lo model.) t ff trating the same respectively before and after placing under tensional strain the metal insertions, which consist in this case of angleiron. Figs. 3, 4, and 5 are cross-sections respectively on the lines A B, C I), and E F ol Fig. .1. Figs. 6, 7, an 8 illustrate the same form of girder when flat or bar iron is used instead of angle-iron.

a represents planksor boards forming tho These metal insertions b are riveted at their ends, that projectv freely from the mold or concrete body, to a channeiiron c in such a manner as to leave a predetermined suitable space between the two angle-irons b. The channel-iron c, which forms the bearing-plate or wall-plate resting free on the vertical Wall or like support., is riveted with both of its side flanges to angle-irons d, which project for a suitable distance over the wall or like support and which are situated in the npper portion of the concrete gin-der when the girder is iinished. The mold-boards a, that serve to form the sides of the girder, are pressed by suitable means, such as bya. screwbolt g, against the angle-irons d. Before the concrete is placed in the mold the iron insertions b are drawn down by means of suitable ine:1ns,`s'iielr"asbone or more screw-bolts(thenumber of such bolts bo ing determined by the length ofthe ;;irder,)` which extend through the mold and which may be connected with the iron insertions in anysnitable mannerfor example, as in the case shown, by means of a hooked head` formed in the boltfengagingwith the iw' sertions b. 'I he boards a, forming the mold, v are caused by the bolts g and the angle-irons d, riveted to the channel-irons cof the wallplate, to oder resistance to an excessive inward sliding on the wall-plates causedb the drawing down of the iron insertions so tensional strain, whereby the boardsa nre in their turn placed under strain. The connection of the bolts y (which are situated obliqnely between the mold-boards a) with the angle-irons l is effected by means of angleirons h, which are arranged across the said angle-irons and riveted to a bar and serve as abutments for the bolts g. The concrete is now placed into the mold, which has been rendered entirely self-supporting by this means. If desired,the concrete may beplaced only in the space above the iron insertions, in which case av ,cirder is produced having.,y a curved nnder side and in which the iron insertions are visible on the said nnder side, or the iron insertions to be entirely covered with concrete, so that they will be situated in the interior of the girder, in which case the girder may have eithera straight or a curved under side. When the concrete surrounding,r the tensoned insertonsbas becolne hard and the mold is to be removed, the boltsf and gareloosenc,wliei-en pon thebox orming the moldganbemdrommwernermi 1. A built-np grdcr comprising a longitudinally-extending reinforcing insertion nuder tension embedded in a mass of plastic ma terial,and bearing-plates projecting from each end thereof.

2. A built-np girder comprisinga reinforcing insertion under tension embedded in a tension embedded in a mass of plastic mate rial, a channel-iron secured to each end of said pair of angle-irons, and a pair of angleirons secured to said channelirons and projecting above the same.

5. A built-up girder comprising a pair of longitudinally-extending angle-irons under tension embedded in a mass of plastic material, said angleirons being snit-ably spaced apart, a channel-iron secured to each end of said pair-of angle-irons, and a pair of angleirons secured to each of said channel-irons and projecting above the latter.

In testimony that I claim the my invention I have signed my name in presfregoingas ence of two subscribing witnesses. y y

RUDOLF GRIMM.

Witnesses:

JOSEF RnBAscn, j ALvEsro S. Houmt. 

